Window-lock



(No ModeL) T. ROBERTSON.

WINDOW LOOK.

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with the other.

NITED STATES ATENT FFIGE.

THOMAS ROBERTSON, OF MINNEAPOLIS, MINNESOTA.

WINDOW-LOCK.

SPECIFICATION forming part of Letters Patent No. 570,503, dated November3, 1896. Application filed May 25, 1896. Serial No. 598,003. (No model.)

To all whom it may concern/I Be it known that I, THOMAS ROBERTSON, acitizen of the United States, residing at Minneapolis, in the county ofHennepin and State of Minnesota, have invented certain new and usefulImprovements in Window-Locks; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention has for its object to provide an improved window lock orcatch; and to this end my invention consists of the novel devices andcombinations of devices hereinafter described, and defined in theclaims.

The preferred form of my invention is illustrated in the accompanyingdrawings, wherein, like letters referring to like parts throughout theseveral views Figure 1 is a view in perspective, showing a portion of awindow with my improved lock or catch secured in working position to onemember of the window-sash and cooperating Fig. 2 is a horizontal sectiontaken substantially on the line X X of Fig. 1, the parts of the lockbeing shown in their section taken on the line X X of Fig. 1, parts ofthe lock being shown in their unlocking positions. Fig. 4 is aperspective view of the lock-ease removed from the window-sash,

ease, looking at the bottom of the same, the

removable bottom piece of the same being shown as removed from workingposition and some parts of said case being broken away.

Referring to the parts of the window, a indicates the window-frame, athe upper window-sash, provided with a glass pane a and a the lowerwindow-sash, provided with a glass pane a all of the ordinaryconstruction. As shown, the inner face of one of the vertical sides ofthe upper'sash a is provided with a vertically-disposed perforated baror strip 1) 12, secured in place by means of screws b This strip 17 b ispreferably formed of iron or other suitable metal, and the sash a isrecessed or cut away back of each perforation Fig. 3 is also ahorizontal b of the bar I), as shown at a, so as to permit theintroduction of a locking-bolt, as will later appear.

The lock or catch is, as shown, secured to and carried by the lower sasha This lock comprises, in its preferred form, as follows: The lock-casec is in the form of a shell-like casting, provided with a hollowedinterior 0, which is closed at its outer end except for a perforation orplunger-seat 0 is closed at its inner end except for a laterally-elongated perforation or plunger seat 0 and is normally closed at its bottomby means of a removable bottom plate a, which is held in place by asmall screw 0 passed therethrough and screwed into said case 0. At oneendthe removable bottom plate 0 is provided with an upturned flange c,which, when said plate 0 is placed in working position, fills in thegap.

formed at the bottom of the plunger-seat c and serves to complete thesame. It will be noted that the inner end of the case 0 is provided witha flange 0 which extends into the seat This flange portion 0 as willlater appear, cooperates with suitable notches out in the locking boltor plunger and serves as a fixed detent for holding said plunger eitherin its locking or unlocking position. The case 0 is also provided with-alaterally-extended seat portion 0 which is perforated at its outerend,as shown at c".

f indicates the locking bolt or plunger, the central portion of which isshown as square in cross-section, While its outer and inner ends,respectively, are rounded and reduced,

as shown at f and f so as to adapt the same to work, respectively, inthe end seats 0 and c of the case a. This lock-plunger f is placed inworking position in the case 0, while the bottom plate c is removed byfirst placing the reduced end fithrough the seat 0 and then moving thereduced end f vertically into the seat 0 After this has beenaccomplished the bottom plate 0 should be placed in working position,after which the plunger cannot be removed endwise from the case onaccount of the increased size of its central portion.

The upper portion of the inner'rednced end f of the locking-plunger isprovided with a pair of notches f which are adapted to be engaged by thedetent c on the inner end of the lock-case. These notches f are locatedat such distances from each other that when one of said notches isengaged with said detent c the locking-plunger will be held in itslocking position, while when the other of said notches is thus engagedsaid plunger will thereby be held in its unlocking position. The plungerf is also provided with another pair of notches f cut vertically in thecentral portion of the same on the side which lies nearest to thelaterally-extended seat portion a of the case. These notches f arespaced apart a distance corresponding to the spacing of the notches f.

g g indicate a sliding detent or retaining device, the inner end 9 ofwhich is adapted for engagement with either one of the notches f of theplunger f and the stem portion of which works outward through the seat 0of said extension a This detent g g is held under a yielding strain,which tends to hold the end portion 9 in engagement with one of saidnotches f by means of a spring g coiled on the stem g and compressedbetween the end portion 9 and the end flange of the extension c Thelocking-plunger f is yieldingly held toward the right, with one of thenotches f in engagement with the detent c", by means of a flat spring h,secured at one end to the interior of the case 0 and bearing with itsfree end against the left side of said plunger f.

As shown, the case 0 is provided with an angular downturned flange 0which, as well as the base-flanges of said case 0, are provided withsuitable screw-holes o \Vhen the look just described is properly securedto the lower sash a the downturnedflange portion 0 of the case should beset into the side of the sash, with the base of the case resting on thetop of the sash and so positioned that when the sash are moved withrespect to each other the end f of the locking-plunger f will be movedin line with the perforations b of the strip b. The lock-case maybe thusheld in position by means of screws 70.

The operation and use of the device is substantially as follows:Normally the parts will stand as shown in Figs. 1 and 2, with theprojecting end f of the locking-plunger in the lowermost perforation bof the strip 1) and both sash locked together and held closed.

In order to move the locking-plunger f into its unlocking position, thatis, with its reduced end f withdrawn from the perforation b of the stripb, it is first necessary to move the inner end f of said plunger towardthe left, so as to disengage the notch f from the detent 0 as shown inFig. 3; but this is not sufficient to release the locking-plunger sothat the same may be withdrawn from its locking position, for, as willalso be noted by reference to said Fig. 3, the spring-held detent g g,under the action of the spring g will move with the plunger f in itslateral movement and keep its engagement with the notch f However, bytaking hold of the stem 9 with the other hand and thereby withdrawingthe end g from the engaged notch f while at the same time holding theinner end in the lock-plunger toward the left, as described, the saidlocking-plunger may be freely moved into its unlocking position andthere held by the said detent c and springheld detent g g, which arethen engaged, respectively, with the members of the notches f and fwhich are nearest to the outer or looking end f of said plunger. It willthus be seen that it requires the use of both hands at one time in orderto operate the look. This is a very important feature, as it renders itpractically impossible to operate the look from the outside of thewindow, even though the window is left partially open.

In virtue of the fact that the lock or catch is mounted on and carriedby one member of the Window-sash and made to engage with the othermember of the same it is possible to open the window either from the topor from the bottom and still look the sash together. This makes itpossible to open the window for the purpose of ventilation, and as longas the window is not opened sufficiently to permit a person to entertherethrough this may be done with as much safety as if the window-sashwere locked in their closed position. This manner of applyinga lock tothe window-sash I consider, broadly, new and desire to claim the same,regardless of the form of lock which may be employed. The genericfeatures of my lock are, however, well adapted for application for thepurposes of locking the sash in various other ways. For instance, thelock might be secured to the window-frame and made to engage thewindowsash, or vice versa. More than this, the principles of my lock maybe employed in connection with screens, doors, and various similardevices. It will also be understood that various alterations in thedetails of construction above described may be made without departingfrom the spirit of my invention.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

1. A look comprising a locking piece or bolt, and two or moreindependent retaining devices, for holding said locking-piece in itslocking position, requiring simultaneous disengagement from saidlocking-piece, to permit the unlocking movement thereof, sub stantiallyas described.

2. A lock comprising a locking piece or bolt, and two or moreindependent retaining devices, for holding said locking-piece in itslocking position, requiring simultaneous disengagement from saidlocking-piece, to per mit the unlocking movement thereof, and springstending to render both of said retaining devices, operative,substantially as described.

3. A look comprising a lock-case, a lockingbolt mounted in said case,for both longitudinal and lateral movements, a fixed catch on said case,with which a cooperating catch on said bolt is engageable anddisengageable, by lateral movement of said bolt, and anindependently-releasable spring-held retaining device adapted to keepengagement with said bolt under its lateral movement, substantially asdescribed.

4. A look comprising a look-case, a lockingbolt, mounted in said casefor both longitudinal and lateral movements, and provided 1 o with twopairs of notches, a fixed catch on said case, with which one pair ofsaid notches is engageable, by lateral movement of said bolt,

